Rear Parking Distance Sensors wiring ?

i always thought it just used a switched live from the reversing light and then any of the earths around it.
 
i bought a dis harness from them once, its quality stuff no doubt but the harness was not exactly the same as advertised, i still had to make mods to it afterwards
 
Maybe.... there's a module that comes with the kit i'm looking at that has two plugs with multiple pins. one plug is connected to the sensors. one plug connects to the siren and then has a whole bunch of wires that i wouldn't know where they go so i don't think it's as simple as a reverse light feed.

Hope someone can chime in with a diagram :)
 
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I found this off of the kufatec website which looks to correlate to the above information

but when looking at my loom's loose ends... i have the following

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- 2 brown wires (i'm assuming they are ground... seems to be the rule with audi)
- grey/white = OBD
- Blue/red = reverse light

then the next 3 are a little more ambiquous

- there seem to be two black? maybe one of them is black with navy stripe???
- then there's a random blue with white stripe sticking out

Anyone have the wiring diagram for this from Bentley manual or something please?

:)